文献类型：期刊文献

中文题名：北京山区侧柏生态系统各组分夜间δ13C变化特征和对环境因子的响应

英文题名：Variation Characteristics of δ13C of Different Components in Platycladus orientalis Ecosystem During Nighttime and Its Response to Environmental Factors in Beijing Mountainous Area

作者：朱栩辉[1] 余新晓[1] 李瀚之[2] 贾国栋[1] 郑鹏飞[1] 王渝淞[1] 孙乐乐[1]

第一作者：朱栩辉

机构：[1]北京林业大学水土保持学院,水土保持与荒漠化防治教育部重点实验室,北京100083;[2]中国林业科学研究院荒漠化研究所,北京100091

年份：2019

卷号：33

期号：5

起止页码：163-170

中文期刊名：水土保持学报

外文期刊名：Journal of Soil and Water Conservation

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金项目(41430747,41877152);科技创新服务能力建设-协同创新中心-林果业生态环境功能提升协同创新中心(2011协同创新中心)(市级)(PXM2018_014207_000024)

语种：中文

中文关键词：稳定同位素;Keeling;plot法;夜间呼吸;环境因子

外文关键词：stable isotope;Keeling plot method;nocturnal respiration;environmental factors

分类号：S715

摘要：采用同位素光谱测定仪对北京山区侧柏人工林生长旺盛期夜间CO2浓度和δ^13 C进行原位观测。分析侧柏林生态系统不同组分夜间呼吸δ^13 C的差异,探究其对环境因子的响应。结果表明:在使用Keeling plot法拟合侧柏林7—9月夜间呼吸作用释放的δ^13 C时,利用大气稳定度作为筛选条件后,拟合精度从0.43增大到0.82,误差从0.54‰~0.99‰下降到0.50‰~0.82‰。δ^13 C变化范围为(-28.76±0.51)‰^(-25.18‰±0.59)‰,呈现先增大后减小的趋势;地上侧柏枝条δ^13 C地上变化范围(-33.16±1.08)‰^(-26.82±0.18)‰,呈增加趋势,在7月底达到最大值,9月变化趋于平稳;地下土壤δ^13 C地下变化范围(-28.55±0.17)‰^(-21.39±0.37)‰,呈增加趋势,7月底达到最大值,变化波动最大,9月变化趋于平稳,各月δ^13 C与时间呈二次函数关系;在生长旺盛期夜间土壤呼吸通量占生态系统呼吸通量的54.77%,δ^13 C地下比δ^13 C地上高2.06‰~7.03‰;逐步回归分析表明,夜间呼吸δ^13 C受大气湿度影响最显著,大气湿度对各组分碳同位素值变化的贡献率均在60%以上。δ^13 C地下不受土壤温度的影响,δ^13 C地上除大气湿度外,大气温度、土壤温湿度对其影响较为均衡。通过对夜间呼吸δ^13 C的研究,可以更全面地评估北京山区森林生态系统碳平衡,为区域森林生态系统经营提供科学依据。
In this study,the isotope spectrometer was used to observe the nighttime CO 2 concentration andδ^13 C during the vigorous growth period of Platycladus orientalis plantation in Beijing mountainous area.The difference of nocturnal respirationδ^13 C of different components of the P.orientalis ecosystem was analyzed,and its response to environmental factors was explored.The results showed that when using the Keeling plot method to fit theδ^13 C released by the nocturnal respiration in the P.orientalis plantation from July to September,the fitting accuracy improved from 0.43 to 0.82 and the error decreased from 0.54~0.99 to 0.50~0.82 after the atmospheric stability was used as the screening condition.The variation range ofδ^13 C was(-28.76±0.51)‰^(-25.18±0.59)‰,which showed a trend of increasing first and then decreasing.The above-ground variation range of the aboveground arborvitae branchδ^13 C was(-33.16±1.08)‰^(-26.82±0.18)‰,and showed an increasing trend,reaching its maximum at the end of July,and tended to be stable in September.The underground variation ofδ^13 C in the underground soil was(-28.55±0.17)‰^(-21.39±0.37)‰,and showed an increasing trend,reaching the maximum in July,as well as the variation was the largest,and the change was stable in September.The relationship betweenδ^13 C in each month and time was quadratic function.During the vigorous growth period,the night soil respiration flux accounted for 54.77%of the ecosystem respiratory flux,and the undergroundδ^13 C was 2.06‰~7.03‰higher than the abovegroundδ^13 C.Stepwise regression analysis showed that the nocturnal respirationδ^13 C was significantly affected by atmospheric humidity.The contribution rate of the atmospheric humidity to the variation of carbon isotope value of each component was more than 60%.The undergroundδ^13 C was not affected by the soil temperature.Except for atmospheric humidity,the atmospheric temperature and soil temperature and humidity had relatively balanced effects on the abovegroundδ^13 C.Through the study of night respirationδ^13 C,it was possible to evaluate more comprehensively the carbon balance of forest ecosystems in Beijing mountainous area,and provide a scientific basis for regional forest ecosystem management.